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How do I solve this ODE system where there exists derivatives in both sides?
Hi Arda, These two equations are of the form p' Jxx - r' Jxz = f(...) where ... = p,q,r,J,J,M,M (a bunch of known stu...

11 Monate vor | 0

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How can I create randomly scattered points between two circles?
(At Adam's suggestion I moved my previous comment to this answer) What tells the tale is the differential area element in the (...

11 Monate vor | 3

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Hi, everyone! I have a question about generating random meshgrid.
Hello yc, If you are willing to make an approximation to the area of each grid quadrilateral then I think there is a reasonably...

11 Monate vor | 0

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Voltage peaks after opening of a contactor in an inductive circuit
Hello Ivan, I'm not sure how you obtain 17.5kV from 500A and 50ns, and 50ns seems really fast if the contactor is mechanical, b...

11 Monate vor | 0

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How to perform a coordinate transformation in a function?
Hi Kovacs Here is one way. Clearly x^2 + t^2 = xi^2 by inspection, so that factor, which is common to both terms, can be sav...

11 Monate vor | 1

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How can I write "StruveL function" in matlab?
Hello Shreen, Here are two ways although you will need the symbolics toolbox for the first one. I used benign values for z and...

12 Monate vor | 0

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This code runs except the graph and results are incredibly wrong
Hi Connor, The reason your code is going to 10^26 is that you are missing an important factor on the last line of rk4, which is...

12 Monate vor | 0

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How to find the max Phase lead provided by a Compensator?
Hi Gidel, It's not a single command and it's numeric, but is w = 0:.001:10; maxangle = (180/pi)*max(angle((i*w+1)./(i*w+3))) ...

12 Monate vor | 1

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impedance matching single stub
Hi Moza, You have most of it, but you need to add a step and change a sign error. The section terminated by R and C, I called ...

12 Monate vor | 0

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11 kV phase to phase voltage, what is the value of phase to ground voltage?
Hi N^2 I believe the result should be Vgnd = 11000/sqrt(3) = 6351 V. However, if the 11000V is RMS, and the voltage to ground ...

12 Monate vor | 0

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5 equations, 5 unknowns using fsolve; with scientific variables
Hi Kaushal, looks like 6 eqns 6 unknowns not 5. All of your unknowns appear in the numerators of the given expressions and no...

12 Monate vor | 0

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Finding Coefficients for the particular solution
Hi Tashanda, let u and v be 2x1 vectors with the coefficient of cos as first element, coefficient of sine as second element, an...

etwa ein Jahr vor | 0

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Power Spectrum estimate using pwelch function
Hi Matthew, I don't think there is an issue here, exactly. pxx_hamming1 is the default psd for pwelch. If you take pxx_hammin...

etwa ein Jahr vor | 1

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Does MATLAB considers poles while COMPLEX integrating a function?
Hi simran, Yes, the 2F1 expression does consider the pole, as you can see by the fact that the expression gets large as z appoa...

etwa ein Jahr vor | 1

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making a 4 x 3 matrix with elements from a 3x7 matrix
Hi Brandon, m1 = rand(3,7) m2 = m1(:,[1 3 4 5]).' m1 = 0.0357 0.6787 0.3922 0.7060 0.0462 0.6948 0...

etwa ein Jahr vor | 0

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why FFT result and IFFT result has diffrent in very small value? how to avoid this to increase precission?
Hi nirwana, This is totally normal behavior, just computation being computation. Matlab uses double precision arithmetic with ...

etwa ein Jahr vor | 0

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Finding positive-, negative- and zero-sequence components in Matlab
Hi Ygor, I believe the problem is that you are going too soon to real values for Ua,Ub,Uc. In Ua = ((exp(1i.*w1.*t)+exp(-1i.*...

etwa ein Jahr vor | 1

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How to solve such integrations on MATLAB?
Hi simran, for any general function f(z) and a set of points [z1, z2, z3 ...] that describes a path in the complex plane (not n...

etwa ein Jahr vor | 0

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How to do LU factorization without permutation？ The lu() is with permutation.
Hi Alvin Certainly you can do the decomposition without permutation, just not with Matlab lu. (Why you might want to is a diff...

etwa ein Jahr vor | 2

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Period of a Linear Congruential Random Number Generator
HI William. If you're still listening, then if you are only interested in the period and not all of the values of x along the w...

etwa ein Jahr vor | 0

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Dot product of two vector
Hello Syazana syms c1 s1 n1 n2 n3 a1 a2 a3 real A = [c1 -s1 0; s1 c1 0; 0 0 1] A = [c1, -s1, 0] [s1, c1,...

etwa ein Jahr vor | 0

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Solve the integral in the point where the function is singular
Hi Dimani, Leaving out the first '1 ' term that has no singularity and leaving off some constants, you are basically looking at...

mehr als ein Jahr vor | 0

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How to generate a noise which sums up as zero?
Hi Ananta, noise=randn(1,64)*sqrt(0.001)*240 noise = noise - mean(noise); if you subtract off the mean, then the new sum of t...

mehr als ein Jahr vor | 0

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Trying to use modified secant method to solve for a theta over different g values.
Hi Carson, let b = g*d^2/(2*v^2) % a distance then your equation (multiplied by -1) is b/cos^2 - d*tan - y = 0 plug in ...

mehr als ein Jahr vor | 0

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I require frequency response from transfer function = 1/(s^2+(b/m)*s+k/m) where b= 0.0011, k= 87.88 , m = 0.99 in matlab and i need freq in khz
Hi sia, there is not much need to do any detailed calculation when your starting point is what it is. This system has a small a...

mehr als ein Jahr vor | 0

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Difference between 2 orientations
Hello Jonathan, You have two 3x3 rotation matrices, each expressed in terms of euler angles, Rrpha(:,1:3) = [cp.*ch, -sp, cp...

mehr als ein Jahr vor | 0

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Can't tell if exprnd is working correctly
Hi Umberto, I believe the issue happens because you are plotting the cumulative variables D1 and D2. Once the difference D1-D2...

mehr als ein Jahr vor | 0

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Raising a large sparse matrix to a large power
Hi if you are operating on 'a particular vector' v then you do not have to iterate as in m = m*m % iterate to form ...

mehr als ein Jahr vor | 2

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I’m thinking of make a command to change Hankel matrix into x time series
Hi Ahmed, here is one way y = magic(5) n = size(y,2); x = zeros(1,2*n-1); x(1:2:end) = diag(y).'; x(2:2:end) = diag(y,1)...

mehr als ein Jahr vor | 0

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How to find the width of a peak where there is no actual data, just individual points?
Hi Alfredo, Usually your ydata would be the frequency domain version of a linear quantity such as voltage or displacement. Hal...

mehr als ein Jahr vor | 1

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